Re: [RESEND v2] git-rebase.txt: rewrite docu for fixup/squash (again)

[Phillip Wood <phillip.wood123@gmail.com>]

Hi Oswald

On 23/10/2023 14:00, Oswald Buddenhagen wrote:
> diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
> index e7b39ad244..337df9ef2f 100644
> --- a/Documentation/git-rebase.txt
> +++ b/Documentation/git-rebase.txt
> @@ -890,20 +890,21 @@ command "pick" with the command "reword".
>   To drop a commit, replace the command "pick" with "drop", or just
>   delete the matching line.
>   
> -If you want to fold two or more commits into one, replace the command
> -"pick" for the second and subsequent commits with "squash" or "fixup".
> -If the commits had different authors, the folded commit will be
> -attributed to the author of the first commit.  The suggested commit
> -message for the folded commit is the concatenation of the first
> -commit's message with those identified by "squash" commands, omitting the
> -messages of commits identified by "fixup" commands, unless "fixup -c"
> -is used.  In that case the suggested commit message is only the message
> -of the "fixup -c" commit, and an editor is opened allowing you to edit
> -the message.  The contents (patch) of the "fixup -c" commit are still
> -incorporated into the folded commit. If there is more than one "fixup -c"
> -commit, the message from the final one is used.  You can also use
> -"fixup -C" to get the same behavior as "fixup -c" except without opening
> -an editor.
> +If you want to fold two or more commits into one (that is, to combine
> +their contents/patches), replace the command "pick" for the second and
> +subsequent commits with "squash" or "fixup".
> +The commit message for the folded commit is the concatenation of the
> +message of the first commit with those of commits identified by "squash"
> +commands, omitting those of commits identified by "fixup" commands,
> +unless "fixup -c" is used. In the latter case, the message is obtained
> +only from the "fixup -c" commit (having more than one of these is
> +incorrect).

This change is incorrect - it is perfectly fine to have more than one 
"fixup -c" command. In that case we use the message of the commit of the 
final "fixup -c" command. One case where there can be multiple "fixup 
-c" commands is  when a commit has been reworded several times via "git 
commit --fixup=reword:<commit>" and the user runs "git rebase --autosquash"

> +If the resulting commit message is a concatenation of multiple messages,
> +an editor is opened allowing you to edit it. This is also the case for a
> +message obtained via "fixup -c", while using "fixup -C" instead skips
> +the editor; this is analogous to the behavior of `git commit`.
> +The first commit which contributes to the suggested commit message also
> +determines the author, along with the date/timestamp.

In the case of

pick A
fixup -C B

don't we keep the authorship from A and just use the commit message from B?

Best Wishes

Phillip